/*
 * The contents of this file are subject to the Mozilla Public License Version
 * 1.1 (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
 * http://www.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the
 * License.
 *
 * The Original Code is ST_EXT-S_UIMAST.
 *
 * The Initial Developer of the Original Code is
 * University of Rome, Tor Vergata
 * Portions created by the Initial Developer are Copyright (C) 2009
 * the Initial Developer. All Rights Reserved.
 */

package it.uniroma2.art.uimast.impl.partial_order;

/**
 * Defines a partial order relation.
 * 
 * @author <a href="mailto:manuel.fiorelli@gmail.com">Manuel Fiorelli</a>
 * 
 * @param <T>
 *            the type of objects to order
 */
public interface Comparator<T> {
	/**
	 * Compares two objects.
	 * @param l
	 *            the left operand
	 * @param r
	 *            the right operand
	 * @return <code>true</code> iff <code>l &lt;= r</code> according to the
	 *         partial order relation
	 */
	public boolean less_equal(T l, T r);
}
